How All Four Of Subaru's AWD Systems Work
What's The Best AWD System -    • What Is The Best AWD System?  
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Subaru currently has four different AWD systems:
1. Viscous Coupling Center Differential AWD
2. Active Torque Split AWD
3. Variable Torque Distribution AWD
4. Driver Controlled Center Differential (DCCD) AWD

Descriptions Below From The Following Link:
https://www.subaru.ca/WebPage.aspx?We...

1. Viscous Coupling Center Differential AWD
"This system is used for all models equipped with manual transmissions, excluding the WRX STI. It delivers the sporty satisfaction of quick shifts combined with an AWD system that makes the most of the available traction at all times. This system also features an efficient layout with a viscous-coupling limited slip centre differential that maintains a 50/50 front/rear torque split for optimum torque distribution, near neutral handling and surefooted performance."

2. Active Torque Split AWD
"This system employs a multi-plate transfer clutch that maintains a 60/40 front/rear torque split and uses a range of sensors to automatically adjust this split on-the-fly as conditions warrant, creating more predictable handling. The system that's linked to all Subaru models (excluding WRX) equipped with the Lineartronic® Continuously Variable Transmission (CVT), the Active Torque Split AWD places the focus on ease of operation, fuel efficiency and reliability."

3. Variable Torque Distribution AWD
"Linked to the Sport Lineartronic® CVT and exclusive to the WRX, this AWD system delivers sportier performance and superior efficiency all at once. The centre differential adjusts front/rear torque split from 45/55 in normal conditions (for a sportier rear-biased feel) up to 50/50 when the weather worsens or the road conditions deteriorate (for maximum traction). The viscous self-locking rear differential maintains stability when more torque is sent to the rear wheels, ensuring the perfect balance of control and fun."

4. Driver Controlled Center Differential (DCCD) AWD
"As it's a purebred high-performance car, it follows that the Subaru WRX STI would feature the ultimate in high-performance AWD systems. The DCCD allows the driver to adjust the centre differential locking (through one manual and three automatic modes), varying the torque split from 41/59 front/rear to 50/50 to suit the mood and the conditions. The AWD system also includes a helical-type front differential and a TORSEN® rear differential, creating a triple-differential set-up that is completely unique in the industry."

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